n.1.A salt of polytungstic acid.
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The SEM micrographs of samples after density separation with sodium polytungstate ([rho] = 2.
The starch residues were extracted by heavy liquid separation using sodium polytungstate with a specific gravity (SG) of 2.
3] of sodium polytungstate (SPT) (Sometu Europe, Germany) following a procedure very similar to that used by Six et al.
Instead, sodium polytungstate solutions were made varying in density up to 3.
If foraminifera were not abundant, as in the Arroyo Colorado samples, they were concentrated for ease of counting using a sodium polytungstate flotation technique (Callahan 1987).
Organic matter was removed with nitric acid and potassium chlorate, the [is less than] 5 [micro]m fraction removed by gravity sedimentation, and phytoliths were density-separated with sodium polytungstate.
treatment with hydrogen peroxide, hydrochloric acid, fluorosilicic acid, fluoboric acid, and the removal of heavy minerals using a sodium polytungstate solution.
Briefly, 10g of air-dried soil (< 2 mm) was placed into 40 mL of sodium polytungstate solution (1.
Heavy minerals were separated using a sodium polytungstate solution at a density of 2.
Briefly, the free light fraction was separated by centrifugation after shaking the soil in a sodium polytungstate solution of density 1.